I am reading up on different sites and getting all different types of info regarding what to use to set the bricks. Is the mix on this site of Sand, Portland and Fireclay strong enough to withstand the heat? some sites mention that portland breaks down at 400 degrees. Also some sites mention to add lime to the mixture which takes over when it gets real hot. Does anyone have any info or first hand expierience with using just the sand, portland, fireclay mix.
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